Thanks, Gees. So yeah, Guard doesn't show up in the Shield menu at all since it automatically gets put into your action bar when you put on a shield. However, in the bottom left section, where it actually gives a description of the action itself, the cost is listed as 0. (As in your example where it lists Circle Slash and immediately below that Cost: 3.) This is why I think Guard either has 0 as a typo in the description box or it's taking up 3 of the slot points that it shouldn't be. Make sense?